Note the coincidence relative to the coeffitient numbers. However, \(\Vert  (\nabla \varphi )_{(i)}\Vert ^2\)  is not equal to \(\Vert  \xi _{(i)}\Vert ^2\) . What is happening?. The answer is based in the conventions followed in [1]} for the exterior product, the exterior derivative, etc. Such conventions are those ones fixed in [2]}. Here we follow those ones fixed, for instance, in [3]}, [4]}. Because of this, one has
\(\varphi = 3! \widetilde{\varphi },\) 
where \(\widetilde{\varphi }\)  is the three-form considered in [1]}. Below we will prove that \(\Vert  \nabla \varphi \Vert ^2 = 36 \Vert  \xi \Vert ^2\) . Therefore,
\( \Vert  \nabla \widetilde{\varphi }\Vert ^2 = \frac{1}{36} \Vert  \nabla \varphi \Vert ^2 = \Vert  \xi \Vert ^2\)  and formulas (REF ) and (REF ) are agree. Thus, Bor and Hernández Lamoneda are really right when they say intrinsic torsion in the introduction of [1]}.
